Location, location, geolocation

LOCATION,
LOCATION,
GEOLOCATION

Where On Earth IDentiﬁers

WOEIDs

http://where.yahooapis.com/v1/place/28584769

GPS (or Assisted-
GPS)
Cellular network ID
WiFi networks
IP sniffing

“Is this that
HTML5 thing I’ve
heard so much
about?”

if (!!navigator.geolocation) {
  // Hooray!
}

if (Modernizr.geolocation) {
  // Hooray!
}

.no‐geolocation button {
  display: none
}

// Success callback
function showMap(position) {
  alert("I see you!");
}

// Make a one‐off position request
navigator.geolocation.getCurrentPosition(showMap);

position = {
  coords: {
    accuracy: 80,
    altitude: null,
    altitudeAccuracy: null,
    heading: null,
    latitude: ‐35.28211547444445,
    longitude: 149.12501867666666,
    speed: null
  },
  timestamp: 307770135
}

position = {
  coords: {
    accuracy: 80,                   // in metres
    altitude: null,                 // in metres
    altitudeAccuracy: null,         // in metres
    heading: null,             // 0‐360°
 
    latitude: ‐35.28211547444445,   // decimal °
    longitude: 149.12501867666666,  // decimal °
    speed: null           // metres per second
  },
  timestamp: 307770135
}

  alert("I see you!");
}

// Error callback
function handleError(error) {
  alert("Oh noes!");
}

navigator.geolocation.getCurrentPosition(
  showMap,
  handleError
);

error = {
  code:     1,
  message:  "User says no."
}

0: UNKNOWN_ERROR
1: PERMISSION_DENIED
2: POSITION_UNAVAILABLE
3: TIMEOUT

  console.log(position);
}

  if(error.code == 1) {
    // Fallback to other option?
  }
}

  showMap,
  handleError
);

  showMap,
  handleError,
  {
      enableHighAccuracy: false,  // boolean
      timeout:            10000,   // in milliseconds
      maximumAge:         60000   // in milliseconds
  }
);

  showMap,
  handleError,
  {
    maximumAge: Infinity,
    timeout:    0
  }
);

  // Thresholds for accuracy and the freshness
  var earliest = Date.now() ‐ 60000;
  var accuracy = 100;
  if(position.timeout > earliest && accuracy > position.coords.accuracy) {
    // We're good, do the things we want!
  } else {
    // Initiate a new position request
    navigator.geolocation.getCurrentPosition(showMap, handleError, {
      maximumAge: 0,
      timeout:    10000
    });
  }
}

navigator.geolocation.getCurrentPosition(showMap, handleError,
  {
    maximumAge: Infinity,
    timeout:    0
  }
);

  // Hooray!
}

  // Sad face :(
}

// Start watching the user’s location
navigator.geolocation.watchPosition(
  showMap,
  handleError
);

  // Check the accuracy
  if (position.coords.accuracy < 100) 
  {
    // We're happy with the position, so stop watching
    navigator.geolocation.clearWatch(watcher);
  }
}

// Start watching the users' location
var watcher = navigator.geolocation.watchPosition(showMap);

http://tinygeocoder.com/

http://code.google.com/apis/maps/documentation/geocoding/

http://developer.yahoo.com/geo/placefinder

YQLGEO
A wrapper for Geolocation services

http://isithackday.com/hacks/geo/yql‐geo‐library/

1. Which cafés are
good?
2. Where are they?
3. In relation to me?

1. Simple
2. Fast
3. Intelligent

1. Which are good?
2. Where are they?
3. In relation to me?

“With great power
comes great
responsibility”

Location, location, geolocation

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